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14 tháng 9 2023

3. b

4. a

14 tháng 9 2023

b

a

31 tháng 3 2019

Rất vui khi bạn giải dc nha

Cũng xin lỗi vì giúp gì dc (bạn giải dc rồi)

Chúc bạn học tốt.

31 tháng 3 2019

Cảm ơn bn

Relative Clause Exercise (Mệnh Đề Quan Hệ) Giúp mik vs đag rất cần!!! Ex1) Combine each pair of sentences, using Relative Adverb “when” or “where” 1. December is a month . It is the coldest in the USA in this month => 2. John will never forget the day. He met for the first time on that day => 3. Danang is a city. I was born and grew up there => 4. London is a big city. We spent our vacation there => 5. The room is very nice. I’m living in that room => Ex2) Combine into a complex...
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Relative Clause Exercise (Mệnh Đề Quan Hệ) Giúp mik vs đag rất cần!!!

Ex1) Combine each pair of sentences, using Relative Adverb “when” or “where”
1. December is a month . It is the coldest in the USA in this month
=>
2. John will never forget the day. He met for the first time on that day
=>
3. Danang is a city. I was born and grew up there
=>
4. London is a big city. We spent our vacation there
=>
5. The room is very nice. I’m living in that room
=>

Ex2) Combine into a complex sentence with relative clause
1. John told me about students. They have taken the entrance exam 3 times
=>
2. The secretary didn’t know where the meeting was. I talked to him
=>
3. You need to talk to the man. You can trust him
=>
4. Bob is the kind of person . One can talk to about anything
=>
5. I am looking for an electric can opener. It also can sharpen knives
=>
Ex3) Combine each pair of sentence, using Relative Clause
1. The woman is my sweetheart. I understand her best
=>
2. The friends went to Canada. I worked with them last year
=>
3. The professor is excellent. I am talking her course
=>
4. The things are strange to me. He is talking about them
=>
5. They spent some days with a businessman. His company imported food and clothes
=>

1
7 tháng 3 2020

Relative Clause Exercise (Mệnh Đề Quan Hệ)

Ex1) Combine each pair of sentences, using Relative Adverb “when” or “where”
1. December is a month . It is the coldest in the USA in this month
=> December is a month which is the coldesr in the USA in this month.
2. John will never forget the day. He met for the first time on that day
=> John will never forget the day which he met for the first time on.
3. Danang is a city. I was born and grew up there
=> Danang is a city where I was born and grew up.
4. London is a big city. We spent our vacation there
=> London is a big city where we spent our vacation.
5. The room is very nice. I’m living in that room.

=> I'm living in the room which is very nice.

Ex2) Combine into a complex sentence with relative clause
1. John told me about students. They have taken the entrance exam 3 times
=> John told me about the students who have taken the entrance exam 3 times.
2. The secretary didn’t know where the meeting was. I talked to him
=> I talked to the secretary who didn't know where the meeting was.
3. You need to talk to the man. You can trust him
=> You need to talk to the man who you can trust.
4. Bob is the kind of person . One can talk to about anything
( Bạn xem lại đề câu này nhé )
5. I am looking for an electric can opener. It also can sharpen knives
=> I am looking for an electric can open which also can sharrpen knives.
Ex3) Combine each pair of sentence, using Relative Clause
1. The woman is my sweetheart. I understand her best
=> The woman whom I understand best is my sweetheart.
2. The friends went to Canada. I worked with them last year
=> The friends whom I worked with last year went to Canada.
3. The professor is excellent. I am talking her course
=> The professor whom I am talking her course is excellent.
4. The things are strange to me. He is talking about them
=> The things which he is talking about are strange to me.
5. They spent some days with a businessman. His company imported food and clothes
=> They spent some days with a bussinessman whose company imported food and clothes.

a: Xét ΔAPE vuông tại P và ΔAPH vuông tại P có

AP chung

PE=PH

Do đó: ΔAPE=ΔAPH

Suy ra: góc EAP=góc HAP

hay AP là phân giác của góc HAE(1)

Xét ΔAHQ vuông tại Q và ΔAFQ vuông tại Q có

AQ chung

HQ=FQ

Do đó: ΔAHQ=ΔAFQ

Suy ra: góc HAQ=góc FAG

hay AQ là tia phân giác của góc HAF(2)

b: Từ (1) và (2) suy ra \(\widehat{EAF}=2\cdot\widehat{BAC}=2\cdot90^0=180^0\)

=>E,A,F thẳng hàng

mà AF=AE
nên A là trung điểm của FE

c: Xét ΔAHB và ΔAEB có

AH=AE
góc HAB=góc EAB

AB chung

Do đó: ΔAHB=ΔAEB

Suy ra: góc AHB=góc AEB=90 độ

=>BE vuông góc với EF(3)

Xét ΔAHC và ΔAFC có

AH=AF

góc HAC=góc FAC

AC chung

Do đó:ΔAHC=ΔAFC

SUy ra: góc AHC=góc AFC=90 độ

=>CF vuông góc với FE(4)

Từ (3) và (4) suy ra BE//CF

19 tháng 1 2018

2 3 13 A B C

Xét \(\Delta ABC\) có :

\(BC^2=AB^2+AC^2\) (Định lí PITAGO đảo)

=> \(BC^2=2^2+3^2\)

=> \(BC^2=13\)

=> \(BC=\sqrt{13}\)

Mà theo giả thiết bài cho : \(BC=\sqrt{13}\)

Nên : \(\Delta ABC\) vuông tại A (đpcm)

20 tháng 1 2018

22=4 , 32=9 , \(\sqrt{13}\)2=13

Ta thấy 13=4+9 nên tam giác này là tam giác vuông tại A

a: Xét tứ giác ABDC có

M là trung điểm của AD

M là trung điểm của BC

Do đó:ABDC là hình bình hành

Suy ra:AB//CD và BA=CD; AC//BD và AC=BD

b: Xét tứ giác AFDE có

AE//DF

AE=DF

Do đó: AFDE là hình bình hành

Suy ra: AF//DE

Xét ΔBKD có

F là trung điểmcủa BD

FI//KD

DO đó:I là trung điểm của BK

=>BI=IK(1)

Xét ΔAMC có

E là trung điểm của AC

EK//AI

DO đó: K là trung điểm của IC

=>KI=KC(2)

Từ (1) và (2) suy ra BI=IK=KC